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Figure 1. Tunneling of apple fruit caused by larvae of the codling moth. Codling moth is the most important insect pest of apple and pears in North America. Damage is done by the larvae, which are cream-colored caterpillars that tunnel fruit and produce âwormyâ apples (Figure 1).
One degree day results when the average temperature for a. day is one degree over the threshold temperature. With codling moth (50 degrees F threshold. temperature), on a day when the average temperature was 51 degrees F, one degree day.